fix: correct rent unit labels and monthly/annual calculation consistency

- NeedAlignmentPanel: display budget row in monthly (CHF/m²/Mt.) to match
  the Preis section, use exact division (no Math.round) to avoid 13×12≠152
- MatchDetailPropertySections + PropertyDetailPublicSections: replace
  Math.round(rentPricePerSqm/12) with exact division; show 2 decimal places
  when monthly is not a whole number (e.g. CHF 12.67 instead of CHF 13)
- Add /Jahr suffix to all 15 displays showing rentPricePerSqm or maxPerSqm
  without a time unit across results, compare, match-detail, supply, and
  anfragencenter components

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/match-detail/MatchDetailPropertySections.tsx

@@ -17,8 +17,11 @@ export function MatchDetailPropertySections({ property, match }: MatchDetailProp
   const flexibleUnits = units.filter(u => u.isFlexible && u.minLettableSqm != null)
   const preMarketUnits = units.filter(u => u.schattenmarktRelease?.enabled)
   const otherUnits = units.filter(u => !u.schattenmarktRelease?.enabled)
-  const monthlyPerSqm = Math.round(property.rentPricePerSqm / 12)
   const totalMonthly = Math.round(property.areaSqm * property.rentPricePerSqm / 12)
+  const rawMonthlyPerSqm = property.rentPricePerSqm / 12
+  const monthlyPerSqmLabel = Number.isInteger(rawMonthlyPerSqm)
+    ? `CHF ${rawMonthlyPerSqm}.–`
+    : `CHF ${rawMonthlyPerSqm.toLocaleString('de-CH', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`
   const minLettable = property.areaSqmMin ?? (flexibleUnits.length > 0 ? Math.min(...flexibleUnits.map(u => u.minLettableSqm!)) : undefined)
   const sourceLabel = property.sourceLabel ?? property.sourceMeta?.sourceLabel ?? SOURCE_LABELS[property.sourceType] ?? property.sourceType
 
@@ -31,7 +34,7 @@ export function MatchDetailPropertySections({ property, match }: MatchDetailProp
           <Typography variant="h6" sx={{ fontWeight: 700 }}>Preis</Typography>
         </Box>
         <KeyFactRow label="Monatliche Miete" value={`CHF ${totalMonthly.toLocaleString('de-CH')}.–`} />
-        <KeyFactRow label="Pro m²/Monat" value={`CHF ${monthlyPerSqm.toLocaleString('de-CH')}.–`} />
+        <KeyFactRow label="Pro m²/Monat" value={monthlyPerSqmLabel} />
         <KeyFactRow label="Pro m²/Jahr" value={`CHF ${property.rentPricePerSqm.toLocaleString('de-CH')}.–`} />
         {property.ancillaryCosts != null && (
           <KeyFactRow label="Nebenkosten" value={`CHF ${Math.round(property.areaSqm * property.ancillaryCosts / 12).toLocaleString('de-CH')}/Mt. (CHF ${property.ancillaryCosts}/m²/a)`} />